Stackoverflow, Wikipedia, I'm sure there are others... sites where you can waste hours of your own (unpaid) time, creating content for the express purpose of helping others, only to have some asshole come along and delete it. I can't speak for anybody else, but the whole thing really diminishes my enthusiasm for contributing to these sites. Hell, I can't remember the last time I created a new Wikipedia article from scratch, after getting tired of the deletionist crap.
So yeah, I can totally understand Gregg's frustration. Who wants to volunteer hours trying to help others, just to receive a big "F you" for your efforts?
This is a huge loss. Whenever I get stuck on a WebGl or OpenGl problem, invariably I find an answer or some sample code that Gregg has written that helps me right through it.
I also worked with him on a graphics team many years ago, and it was just the same. He was the guy who knew graphics inside out, and could whip up a crazy demo in no time.
The thankless few who spend hours crafting good answers to help people asking in the void like this are the real heroes of society. So are those working on open source only to get hate from users.
So yeah, I can totally understand Gregg's frustration. Who wants to volunteer hours trying to help others, just to receive a big "F you" for your efforts?